US9364663B2 - Detector for electromagnetic fields - Google Patents

Detector for electromagnetic fields Download PDF

Info

Publication number
US9364663B2
US9364663B2 US14/697,062 US201514697062A US9364663B2 US 9364663 B2 US9364663 B2 US 9364663B2 US 201514697062 A US201514697062 A US 201514697062A US 9364663 B2 US9364663 B2 US 9364663B2
Authority
US
United States
Prior art keywords
magnetic field
imd
detection unit
field sensors
control unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US14/697,062
Other languages
English (en)
Other versions
US20150352354A1 (en
Inventor
Thomas Doerr
Ingo Weiss
Steffen KIBBEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Biotronik SE and Co KG
Original Assignee
Biotronik SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Biotronik SE and Co KG filed Critical Biotronik SE and Co KG
Priority to US14/697,062 priority Critical patent/US9364663B2/en
Assigned to BIOTRONIK SE & CO. KG reassignment BIOTRONIK SE & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DOERR, THOMAS, Kibbel, Steffen, WEISS, INGO, DR.
Publication of US20150352354A1 publication Critical patent/US20150352354A1/en
Application granted granted Critical
Publication of US9364663B2 publication Critical patent/US9364663B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/08—Arrangements or circuits for monitoring, protecting, controlling or indicating
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/37—Monitoring; Protecting
    • A61N1/3718—Monitoring of or protection against external electromagnetic fields or currents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
    • A61N1/39—Heart defibrillators
    • A61N1/3925—Monitoring; Protecting
    • A61N1/3931—Protecting, e.g. back-up systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/022—Measuring gradient
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/285—Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room

Definitions

  • Embodiments of the invention generally relate to a method for identifying electromagnetic fields with implantable medical devices, specifically electromagnetic fields that occur when using nuclear magnetic resonance imaging and tomography (e.g., MRI, MRT) devices.
  • nuclear magnetic resonance imaging and tomography e.g., MRI, MRT
  • MR magnetic resonance
  • MRI magnetic resonance imaging
  • MRT magnetic resonance tomography
  • U.S. Pat. No. 6,522,920 to Silvian et al. entitled “System and Method of Protecting Transformer-Driven Switches from External Magnetic Fields”, describes a system for protecting the inductively actuated high-voltage switch of an ICD during shock delivery in a magnetic field.
  • the system monitors whether a sufficient gate voltage is provided at the moment of the shock delivery. According to Silvian et al., the monitoring is assessed by means of an assessment of the secondary voltage of the inductive drivers.
  • United States Patent Publication 20080071168 to Gauglitz et al., entitled “Systems and Methods for Sensing External Magnetic Fields in Implantable Medical Devices”, provides an impedance measuring unit and an RLC member for detection of a magnetic field and to perform the detection by determining the inductance in the RLC component.
  • an additional or adapted impedance measuring unit is required for this purpose.
  • U.S. Pat. No. 7,509,167 to Stessman entitled “MRI Detector for Implantable Medical Device”, describes the identification of a magnetic field by the measurement of the timings for the actuation of the high-voltage transformer of the primary side or alternatively by the measurement of peak currents during a charging cycle.
  • the disadvantages of the described system of Stessman are that the measurement of the timings has to be very quick (us to ns), and that a direct current measurement may only be implemented with difficulty due to the necessary measuring resistor, which would lengthen the charge times for the high-voltage capacitor.
  • One or more embodiments of the invention include an implantable medical device (IMD).
  • IMD implantable medical device
  • the IMD includes at least one power supply, one or more of at least one sensing device and at least one stimulation device, at least one control unit, at least one MR detection unit, and at least two magnetic field sensors.
  • the at least one power supply may be connected directly or indirectly to one or more of the at least one sensing device, the at least one stimulation device, the at least one control unit, the at least one MR detection unit and the at least two magnetic field sensors.
  • the at least one control unit may be connected directly or indirectly to one or more of the at least one sensing device and the at least one stimulation device.
  • the at least one control unit may be connected directly or indirectly to the at least one MR detection unit and to the at least one magnetic field sensor.
  • the at least two magnetic field sensors may be arranged spatially separately from one another.
  • the at least one MR detection unit may determine a spatial and/or temporal gradient of magnetic field strengths, wherein the magnetic field strengths are detected by the at least two magnetic field sensors and transmitted to the at least one MR detection unit.
  • the at least one MR detection unit may detect an MR field and transmit an MR signal to the at least one control unit if either
  • the gradient may indicate a change of a magnetic field in space or in time
  • the detection with the at least two magnetic field sensors provided in the IMD may be determined via a variation of the measured magnetic field strengths over time, wherein the at least two magnetic field sensors are arranged rigidly in the respective IMD or in an electrode line.
  • the term MR field includes the electromagnetic field of an MR device.
  • a static magnetic field of an MR or MRI device is used, wherein the static magnetic field is particularly strong.
  • each magnetic field sensor of the at least two magnetic field sensors may include a GMR sensor, a Hall sensor, a reed switch, a MagFET, or any combination thereof, or any another magnetic field sensor within the field of the invention.
  • the at least one control unit may change into a predetermined operating mode in response to the MR signal of the at least one MR detection unit.
  • the predetermined operating mode may be an MR-safe state or an MR mode.
  • the IMD may include an implantable pacemaker and/or a defibrillator/cardioverter (ICD), or may include a cardiac resynchronization IMD with an ICD and/or pacemaker.
  • ICD defibrillator/cardioverter
  • the IMD may include a neurostimulator or a drug pump.
  • an MR-safe state may include a suppression of delivery of high-voltage shocks and/or provision of alternative IMD modes.
  • an MR-safe state may include temporary switch-off of the IMD function, such as suppression of the delivery of IMD stimulations, or may include the switchover into an asynchronous stimulation mode, such as delivery of IMD stimulations without consideration and/or detection of rhythms naturally produced naturally in a body.
  • a decision regarding a suitable MR-safe state may be made either when programming the IMD, or automatically when programming the IMD, or automatically during the detection of an MR field, or automatically at predetermined moments in time, or with certain events or patient states.
  • the IMD may be switched into an MR-safe state (MR mode) by programming or by remote programming.
  • the predetermined operating mode includes parameters that may be predetermined in accordance with one or more of the magnetic field strengths determined by the at least one MR detection unit, the temporal gradient fields and/or spatial gradient fields.
  • the at least one MR detection unit may evaluate the gradient and absolute value of the detected magnetic field strengths when the detected magnetic field strengths lie below the first predetermined threshold value.
  • the at least two magnetic field sensors may be arranged within the IMD or at least one of the magnetic field sensors may be arranged within the IMD and at least one further magnetic field sensor may be arranged in an electrode line connected to the IMD.
  • an electrode line may be one or more of a line that applies electronic pulses and a sensor line.
  • the respective sensor may be connected electronically, optically or optoelectronically to the IMD.
  • the electrode line may be one or more of a hollow line to apply drugs and a sensor line.
  • the at least one MR detection unit may form a signed difference between the at least two magnetic field sensors, and may use different first predetermined threshold values and/or second predetermined threshold values and/or first predetermined range of threshold values, depending on the sign, to detect the MR field.
  • the minimum distance between the at least two magnetic field sensors is selected in accordance with a resolution of the at least two magnetic field sensors, such that the resolution is sufficient to distinguish between a local magnetic field and a widely distributed MR field with reference to the spatial gradients.
  • a local magnetic field may include magnetic fields of permanent magnets or electromagnets as are present in a patient environment (for example in the form of loudspeakers or simple permanent magnets).
  • the widely distributed MR fields differ from the local fields by their size.
  • the magnetic fields may thus extend about 100-150 cm beyond the MR device with significantly measurable field strength of more than 2 mT, wherein 2 mT is a response threshold of the reed switch in conventional cardiac pacemakers.
  • 2 mT is a response threshold of the reed switch in conventional cardiac pacemakers.
  • typical magnetic fields to be expected in the patient environment achieve a propagation of a few centimeters within such a field strength.
  • the MR signal may be transmitted to the at least one control unit and the at least one control unit may cause at least one predetermined automatic switchover of at least one implant setting of the IMD.
  • the IMD may include one or more of at least one elongate electrode line and at least one sensor line.
  • the at least one MR detection unit may identify an MR-typical journey of an IMD on a patient bed, based on one or more of a change over time of the measured values of the at least two magnetic field sensors and a difference between the measured values of the at least two magnetic field sensors.
  • an MR-typical journey may include the entry or the exit of the patient bed into or out of the MR device or MRI device, with a patient having an IMD.
  • the patient may be brought at speed into or out of a scanning position of the respective MR device, thus enabling determination of a change in the magnetic field strengths.
  • predetermined or predeterminable parameters and/or threshold values and/or settings may be set, changed or predetermined, or any combination thereof, via one or more of a local programming device and remote programming.
  • “remote programming” may include the programming of an IMD, wherein the IMD and a programming unit or a programming end may be spatially separated from one another, such that near-field telemetry (for example ⁇ 10 m) typically present is not sufficient alone to bridge the spatial separation.
  • near-field telemetry for example ⁇ 10 m
  • a switch-on of the MR-safe sate or when the MR-safe state has been switched on may be transmitted using telemetric remote monitoring, such as a home monitoring system.
  • a signal or information is sent directly or via at least one intermediate device, for example a patient device, to a central unit, wherein the central unit processes the information or the signal or forwards it on where necessary.
  • the information or the signal may be sent or transmitted at a later moment in time, for example as soon as there is a connection to the central unit or when such a connection may be produced.
  • telemetric remote monitoring may include wherein information or signals may be transmitted from an IMD to a spatially distanced unit in order to enable a monitoring of the patient, even without a doctor's visit or hospitalization, for example, in that data may be transmitted from the IMD via a service center to a responsible doctor. In one or more embodiments, data may also be transmitted via the service center to the IMD.
  • One or more embodiments of the invention may include a combination of methods for detecting electromagnetic fields, especially MR fields, and in combination with different responses to electromagnetic fields, especially MR fields.
  • further detection methods may include one or more of:
  • indicators may include methods and/or devices that determine whether electromagnetic interference fields are present.
  • At least one embodiment of the invention may include other responses as further responses to detected electromagnetic fields, especially MR fields, such as, but not limited to, one or more of
  • One or more embodiments of the invention may include a position sensor to check plausibility, and to check if positive identification of MR is only given when the position sensor signals a prone posture and/or another presettable posture.
  • At least one embodiment of the invention may include the combination of the position sensor with the identification of an MR-typical journey of an IMD on the patient bed, wherein such a combination provides a particularly high sensitivity for the identification of MR fields of MR devices.
  • the position sensor may be self-calibrating, wherein the calibration takes place under presettable marginal conditions, such as, but not limited to, one or more of time of day, heart rate, breathing rate, hemodynamic parameters, and activity (such as using a motion sensor).
  • presettable marginal conditions such as, but not limited to, one or more of time of day, heart rate, breathing rate, hemodynamic parameters, and activity (such as using a motion sensor).
  • FIG. 1 shows a schematic illustration of a course of an MR examination
  • FIG. 2 shows a schematic illustration of a course of an MR BO field
  • FIG. 3 shows a schematic illustration of an oversensing in MRT
  • FIG. 4 shows a schematic illustration of an IMD with a two-magnetic field sensor system; according to one or more embodiments of the invention.
  • FIG. 1 shows a schematic illustration of a course of a typical MR examination with an MR-compatible ICD.
  • an ICD patient 100
  • the ICD is switched off ( 110 ) in order to rule out an inadequate shock delivery during the MR scan by oversensing caused by the electromagnetic alternating fields acting on the electrode line.
  • the MRT examination may be carried out by a radiologist after a temporal delay lasting from hours to days ( 120 ). After a further delay, the patient may again be treated by the cardiologist ( 130 ) and the ICD may be switched back on.
  • the patient is without the protection of the implanted defibrillator and may be without rhythm monitoring.
  • the remaining residual risk for example, which may be measured in proportion to the benefit of the MRT examination, is generally accepted.
  • FIG. 2 shows a schematic illustration of a course of an MR BO field, and the problem with using an individual magnetic field sensor for MRT identification.
  • the field strength distribution of the BO field of an MR device beyond the scanner is plotted by way of example ( 200 ).
  • the magnetic field strengths may fall to approximately 5 mT at the head end of the patient, such that a magnetic field sensor in an implant in the vicinity of the head cannot perceive any MR-typical magnetic field strengths, and thus does not perform an automatic MR switchover.
  • the implant would generally be located at a corresponding distance from the magnet of the MR device.
  • the MR-typical magnetic field distribution differs considerably in terms of its “size” from that of a “normal” magnetic field source to be expected in the patient environment, for example a magnet in a programmer head.
  • the field strengths above 2 mT may achieve a propagation of a few centimeters (typically ⁇ 10 cm).
  • FIG. 3 shows a schematic illustration of an oversensing in MRT, wherein a measurement ( 300 ) is performed with an ICD system in a position of a patient with the feet in the isocenter and an implant in a chest region ( 210 ) of the patient (as shown in FIG. 2 ).
  • an oversensing ( 310 , 320 ) is distinct in the ventricular sensing channels, which may lead to, in using an undeactivated ICD, to an inadequate shock therapy.
  • Such oversensing is shown in the marker channel at fast right-ventricular detection markers ( 311 ), which are perceived by the implant following the distinct MR interference ( 312 ) above a threshold value. If the number of fast detection markers ( 311 ) exceeds a programmable limit value, an ICD may inadequately introduce an antitachycardia therapy.
  • the magnetic field to be measured at the implant is only approximately 30 mT.
  • FIG. 4 shows an IMD system with two magnetic field sensors, according to one or more embodiments of the invention.
  • implantable medical device such as a cardiac pacemaker
  • the implant may be connected to an electrode line ( 420 ), which senses and stimulates the heart via a distal dipole ( 430 ).
  • the electrode line ( 420 ) includes a further magnetic field sensor ( 440 ), of which the measured values may be queried by the IMD.
  • the second magnetic field sensor ( 440 ) when the first magnetic field sensor ( 410 ) senses a magnetic field above a threshold, the second magnetic field sensor ( 440 ) is queried, and an MRT switchover may then occur if the second magnetic field sensor ( 440 ) also indicates a magnetic field above the threshold.
  • the threshold of the second magnetic field sensor ( 440 ) may be derived from a measured magnetic field of the first magnetic field sensor ( 410 ), and magnetic field propagations to be expected with MRT are set accordingly.
  • a reliable distinction between local magnetic fields, such as patient magnets, or MR-typical magnetic fields beyond the scanner may be made.
  • the evaluation of the second magnetic field sensor ( 440 ) may be omitted.
  • the second magnetic field sensor ( 440 ) may be integrated in the electrode line, such as using one or more of a reed switch, a GMR sensor or the like, and the second magnetic field sensor ( 440 ) may function with a fixed threshold (for example 5 mT).
  • the MR environment may then be confirmed (for example a field >1 mT) or rejected (for example a field ⁇ 1 mT) upon activation of the electrode sensor, such as the second magnetic field sensor ( 440 ) integrated in the electrode line, via the implant sensor, such as the first magnetic field sensor ( 410 ).

Landscapes

  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electrotherapy Devices (AREA)
  • Neurology (AREA)
US14/697,062 2014-06-05 2015-04-27 Detector for electromagnetic fields Expired - Fee Related US9364663B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/697,062 US9364663B2 (en) 2014-06-05 2015-04-27 Detector for electromagnetic fields

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201462007953P 2014-06-05 2014-06-05
US14/697,062 US9364663B2 (en) 2014-06-05 2015-04-27 Detector for electromagnetic fields

Publications (2)

Publication Number Publication Date
US20150352354A1 US20150352354A1 (en) 2015-12-10
US9364663B2 true US9364663B2 (en) 2016-06-14

Family

ID=53015538

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/697,062 Expired - Fee Related US9364663B2 (en) 2014-06-05 2015-04-27 Detector for electromagnetic fields

Country Status (2)

Country Link
US (1) US9364663B2 (de)
EP (1) EP2952224A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190039466A1 (en) * 2017-08-07 2019-02-07 Hyundai Motor Company Charging control method, electric vehicle and charging apparatus using the same
US10641858B2 (en) * 2017-04-06 2020-05-05 Bilkent University Spatiotemporal magnetic field monitoring with hall effect sensors during the MRI scan
WO2021165008A1 (en) 2020-02-21 2021-08-26 Biotronik Se & Co. Kg Implantable medical device configured for detecting a presence of an mri device
WO2021224087A1 (en) 2020-05-06 2021-11-11 Biotronik Se & Co. Kg Medical system for performing a therapeutic function on a patient
WO2022008215A1 (en) 2020-07-08 2022-01-13 Biotronik Se & Co. Kg Implantable medical device operative in the presence of an mri device
US11844599B2 (en) 2019-11-25 2023-12-19 GE Precision Healthcare LLC Scanning control system and method for magnetic resonance imaging system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2941431C (en) * 2014-03-28 2018-01-09 Aetonix Systems Simple video communication platform
US10652504B2 (en) 2014-03-28 2020-05-12 Aetonix Systems Simple video communication platform
US10286209B2 (en) 2016-04-29 2019-05-14 Medtronic, Inc. Methods and implantable medical devices for automatic entry to an exposure mode of operation upon exposure to a magnetic disturbance
US20200012008A1 (en) * 2018-07-08 2020-01-09 Wayne State University Parity-time (pt)-symmetric wireless telemetric sensors and systems
US20220111201A1 (en) * 2020-10-08 2022-04-14 Inspire Medical Systems, Inc. Identifying a presence-absence state of a magnetic resonance imaging system
WO2024193999A1 (en) * 2023-03-21 2024-09-26 Biotronik Se & Co. Kg Mode adjustment arrangement
AU2024354654A1 (en) * 2023-10-06 2026-04-02 Axonics, Inc. Mri detection system for implantable medical device

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6101417A (en) 1998-05-12 2000-08-08 Pacesetter, Inc. Implantable electrical device incorporating a magnetoresistive magnetic field sensor
US6522920B2 (en) 2000-12-11 2003-02-18 Pacesetter, Inc. System and method of protecting transformer-driven switches from external magnetic fields
US20060293591A1 (en) 2005-05-12 2006-12-28 Wahlstrand John D Implantable medical device with MRI and gradient field induced capture detection methods
US20080071168A1 (en) 2006-07-26 2008-03-20 Karl Gauglitz Systems and methods for sensing external magnetic fields in implantable medical devices
US7509167B2 (en) 2006-02-16 2009-03-24 Cardiac Pacemakers, Inc. MRI detector for implantable medical device
US20090138058A1 (en) * 2004-12-17 2009-05-28 Cardiac Pacemakers, Inc. Mri operation modes for implantable medical devices
US20100176808A1 (en) 2009-01-09 2010-07-15 Ela Medical S.A.S Detection of strong static magnetic fields and mri examination safekeeping for an implantable cardiac prosthesis
US20110092802A1 (en) 2009-10-16 2011-04-21 Kabushiki Kaisha Toshiba Active implant communications with medical imaging scanner
US20110137359A1 (en) 2009-12-08 2011-06-09 Stubbs Scott R Implantable medical device with automatic tachycardia detection and control in mri environments
EP2338414A1 (de) 2009-12-22 2011-06-29 Biotronik CRM Patent AG Lagesensor zur MRT-Erkennung
US20120194191A1 (en) 2011-01-28 2012-08-02 Medtronic, Inc. Techniques for detecting magnetic resonance imaging field
US20130289384A1 (en) 2012-04-26 2013-10-31 Medtronic, Inc. Devices and techniques for detecting magnetic resonance imaging field

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6101417A (en) 1998-05-12 2000-08-08 Pacesetter, Inc. Implantable electrical device incorporating a magnetoresistive magnetic field sensor
US6522920B2 (en) 2000-12-11 2003-02-18 Pacesetter, Inc. System and method of protecting transformer-driven switches from external magnetic fields
US20090138058A1 (en) * 2004-12-17 2009-05-28 Cardiac Pacemakers, Inc. Mri operation modes for implantable medical devices
US20060293591A1 (en) 2005-05-12 2006-12-28 Wahlstrand John D Implantable medical device with MRI and gradient field induced capture detection methods
US7509167B2 (en) 2006-02-16 2009-03-24 Cardiac Pacemakers, Inc. MRI detector for implantable medical device
US20080071168A1 (en) 2006-07-26 2008-03-20 Karl Gauglitz Systems and methods for sensing external magnetic fields in implantable medical devices
US20100176808A1 (en) 2009-01-09 2010-07-15 Ela Medical S.A.S Detection of strong static magnetic fields and mri examination safekeeping for an implantable cardiac prosthesis
US20110092802A1 (en) 2009-10-16 2011-04-21 Kabushiki Kaisha Toshiba Active implant communications with medical imaging scanner
US20110137359A1 (en) 2009-12-08 2011-06-09 Stubbs Scott R Implantable medical device with automatic tachycardia detection and control in mri environments
EP2338414A1 (de) 2009-12-22 2011-06-29 Biotronik CRM Patent AG Lagesensor zur MRT-Erkennung
US8768430B2 (en) 2009-12-22 2014-07-01 Biotronik Crm Patent Ag MRT interference field detection medical implant with prone posture position sensor
US20120194191A1 (en) 2011-01-28 2012-08-02 Medtronic, Inc. Techniques for detecting magnetic resonance imaging field
US20130289384A1 (en) 2012-04-26 2013-10-31 Medtronic, Inc. Devices and techniques for detecting magnetic resonance imaging field

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
European Search Report received from EP Application Serial No. 15164573.6-1652, dated Oct. 9, 2015, 7 pages.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10641858B2 (en) * 2017-04-06 2020-05-05 Bilkent University Spatiotemporal magnetic field monitoring with hall effect sensors during the MRI scan
US20190039466A1 (en) * 2017-08-07 2019-02-07 Hyundai Motor Company Charging control method, electric vehicle and charging apparatus using the same
US11844599B2 (en) 2019-11-25 2023-12-19 GE Precision Healthcare LLC Scanning control system and method for magnetic resonance imaging system
US12089923B2 (en) 2019-11-25 2024-09-17 GE Precision Healthcare LLC Scanning control system and method for magnetic resonance imaging system
WO2021165008A1 (en) 2020-02-21 2021-08-26 Biotronik Se & Co. Kg Implantable medical device configured for detecting a presence of an mri device
WO2021224087A1 (en) 2020-05-06 2021-11-11 Biotronik Se & Co. Kg Medical system for performing a therapeutic function on a patient
US12508429B2 (en) 2020-05-06 2025-12-30 Biotronik Se & Co. Kg Medical system for performing a therapeutic function on a patient
WO2022008215A1 (en) 2020-07-08 2022-01-13 Biotronik Se & Co. Kg Implantable medical device operative in the presence of an mri device

Also Published As

Publication number Publication date
EP2952224A1 (de) 2015-12-09
US20150352354A1 (en) 2015-12-10

Similar Documents

Publication Publication Date Title
US9364663B2 (en) Detector for electromagnetic fields
US8768430B2 (en) MRT interference field detection medical implant with prone posture position sensor
US8583210B2 (en) Apparatus and method for communication between MRI system and implantable medical devices
US8750997B2 (en) Implantable medical device including isolation test circuit
JP6185563B2 (ja) 磁気共鳴画像化磁場を検知するための装置及び技法
US8423133B2 (en) Switched protective device against electromagnetic interference
US8818506B2 (en) Detection of strong static magnetic fields and MRI examination safekeeping for an implantable cardiac prosthesis
US8554300B2 (en) MRI gradient field detector
US7561915B1 (en) MRI system having implantable device safety features
US20110160565A1 (en) Detecting proximity to mri scanner
US11097119B2 (en) System and method for protecting against magnetic fields produced by MRI
US20110160558A1 (en) Implantable radiopaque marking
EP2338564B1 (de) MRT-Optokoppler
US9603549B2 (en) Implantable device with post-MRI cardiac signal sensing adjustment
US8710841B2 (en) Sensing during magnetic resonance imaging
US8558514B2 (en) Detector for electromagnetic fields
Gold et al. Preclinical evaluation of implantable cardioverter-defibrillator developed for magnetic resonance imaging use
US20110202104A1 (en) Method and system for automatically switching between modes of an implantable medical device based on an external magnetic field
US8644920B2 (en) Implantable medical device having magnetic resonance tomography antenna
Kontonasakis et al. Magnetic Resonance Imaging and Implantable Devices

Legal Events

Date Code Title Description
AS Assignment

Owner name: BIOTRONIK SE & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DOERR, THOMAS;WEISS, INGO, DR.;KIBBEL, STEFFEN;REEL/FRAME:035503/0648

Effective date: 20140513

STCF Information on status: patent grant

Free format text: PATENTED CASE

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 4

FEPP Fee payment procedure

Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

LAPS Lapse for failure to pay maintenance fees

Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20240614